At the back of the dining room area you could put a wall-to-wall bookcase filled with books. If you don't have that many books you can have a display bookcase where you place nick backs, a few books, some magazine, sculptures etc.

This grey living room with floor to ceiling bookcases uses a very uniform shelf structure but displays the books themselves in a random, jumbled way, creating a unque and interesting feature wall. I like the grey shelves